Effect of Alkali Treatment on Photovoltaic Performances of Cu(In,Ga)(S,Se)2 Solar Cells and Their Absorber Quality Analyzed by Urbach Energy and Carrier Recombination Rates,ACS Applied Energy Materials

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Effect of Alkali Treatment on Photovoltaic Performances of Cu(In,Ga)(S,Se)2 Solar Cells and Their Absorber Quality Analyzed by Urbach Energy and Carrier Recombination Rates
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-15 00:00:00 , DOI: 10.1021/acsaem.9b02293
Jakapan Chantana _{1,

2} , Yu Kawano ₁ , Takahito Nishimura ₃ , Yoshinori Kimoto ₄ , Takuya Kato ₄ , Hiroki Sugimoto ₄ , Takashi Minemoto ₁

Affiliation

Cd-free Cu(In,Ga)(S,Se)₂ (CIGSSe) solar cells are fabricated by all-dry process, where CIGSSe absorbers with and without alkali (K and Cs) treatments are used. Urbach energy (E_U) is estimated in long-wavelength edge of external quantum efficiency. It is revealed that reduced E_U through K and Cs treatments yields decreased open-circuit voltage deficit. Carrier recombination rates across devices are reduced through K and Cs treatments, corresponding to increased carrier lifetimes and decreased E_U. Conversion efficiency of Cd-free CIGSSe solar cells with a structure of glass/Mo/CIGSSe/Zn_0.8Mg_0.2O/Zn_0.9Mg_0.1O:Al is enhanced from about 17.8% (none alkali) to 18.5% (with K) and to 20.3% (with Cs).

中文翻译：

用Urbach能量和载流子复合率分析碱处理对Cu（In，Ga）（S，Se）₂太阳能电池光伏性能及其吸收剂质量的影响

通过全干法制造无镉的Cu（In，Ga）（S，Se）₂（CIGSSe）太阳能电池，其中使用了经过和不经过碱（K和Cs）处理的CIGSSe吸收剂。Urbach能量（E _U）是在外部量子效率的长波边缘估计的。结果表明，通过K和Cs处理降低的E _U可以降低开路电压赤字。跨设备载流子复合速率通过K和Cs的治疗减少，对应于增加的载流子寿命和降低的ë _ü。玻璃/ Mo / CIGSSe / Zn结构的无镉CIGSSe太阳能电池的转换效率_0.8 Mg _0.2 O / Zn _0.9 Mg _0.1O：Al从约17.8％（无碱）提高到18.5％（含K）和20.3％（含Cs）。

更新日期：2020-01-15

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